wip: cave planner squash-merged into wip/combined (L173, RED - not for main)

Five conflicts resolved (CURRENT-STATE, ResolvedLayoutInternal.h, StreamBenchmarkHeadless.cpp,
StreamBenchmarkPipeline.h, WorldAssemblyPrototype.h) keeping liminal + cave planner; L156 band fit only; evaluator v239
with v239 baselines (18/18 Clang/GCC W1/W8/W12). Fast tier FAILS (FI upper arrival: 40 unsupported chamber samples,
10 chamber-floor shell violations); TN and VS composed sweeps 0/16 (passage, seam, shell gates). Living plane loads at
PostConfigInit (UE smoke passes). Source/: VoxelForgeCoreAdapter.cpp; VoxelForge.uplugin.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Standalone/Research/WorldAssemblerM3/Linux134/REPORT.md

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+# Linux134 — Tunnel Network cave planner
+
+`TunnelNetwork` dispatches native `Core.Caves.PrimitiveField` v1. Seed 0 is strict-valid: 30 compound rooms, 72 room primitives, 31 edges, 3 branches, and a destination chamber. Its 27-point backbone spans 400.620 m horizontally with a 59.021 m floor change and an 8.381° maximum grade.
+
+Design 4 gives backbone rooms and edges one continuous floor profile `h(s)`. Edge curves follow that profile; each room primitive is placed at its own profiled floor. Side branches keep independent flat floors. Overlap backing is capped at the lower floor. This removes the descending-joint capsule blockage. The incoming passage remains fully open: 21,425/21,425 samples.
+
+The final-source fast tier passes in 370.8 s, including owner passage, shell, floor, ripple and negative-control audits. The default composed route audit passes: 0 blocked, 0 unsupported, 0 grade failures across 51,975 cave-route capsule samples; blocked-route controls detect their controls. The tile seam audit also passes (4 pairs, 4,900 shared samples, 0 mismatches).
+
+Seed 2's cave route passes independently (0 blocked, 0 unsupported, 0 grade failures), but its full composed audit still fails at `passage/1-2/0`: 22 unsupported samples, first at `(15.153, 5.830, -754.680) m`. Seed 1's cave route has 24 blocked samples at the arrival mouth, beginning near `(8.380, -12.618, -864.420) m` on `passage/2-3/0`. Explicit seeds 0 and 3 produce no sweepable route candidates. The default seed is the only fully green composed audit among these runs.
+
+Clang and GCC W1/W8/W12 match all 13 pipeline hash lines at the cave camera; each route audit passes. Seven legacy/planner cutaway pairs cover the arrival room, two backbone rooms, two tunnels, destination chamber, and departure room. All planner views render; several legacy cutaways show sparse geometry. Review them in `Saved/Linux/l134/captures/COMPARE.html`.
+
+L80 timing used five interleaved samples per binary at W8/W12. Values below are the planner median change versus `assembler/world`; each cell is whole-view ready / LOD0–2 ready.
+
+| Strate | W8 | W12 |
+|---|---:|---:|
+| 0 | -0.70% / +1.52% | +0.97% / +3.50% |
+| 1 | +3.81% / +8.38% | +2.41% / +6.19% |
+| 2 | +3.38% / +12.90% | +3.98% / +10.26% |
+| 3 | +7.97% / +13.54% | +1.93% / +7.67% |
+
+The VFHost Linux Development build succeeds with `-NoUBA -MaxParallelActions=4`. Final Clang/GCC source stamp: `f3b69ea0ce186c855643702a88e0d0732c81c18ec93c17d1824c25210e6408a3`. Canonical owner hashes are pinned at v230.
+
+Logs and timing data are under `Saved/Linux/l134`; the timing summary is `timing/v230-summary.json`, the final fast log is `verify-fast-final-source.log`, and the host build log is `ubt.log`.
+
+The separate legacy `--audit-native-caves` signature check still fails its mouth offset (it expects 1.00 m; the route contract is 1.13 m) and ripple span (1.8878 m against its 1.25 m cap). Its center-air, floor-solid, and shell probes pass; the composed owner route audit above is green.

Standalone/Research/WorldAssemblerM3/Linux134/layout-seed0-final-gate.json

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Standalone/Research/WorldAssemblerM3/Linux134/layout-seed0-third-design.json

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Standalone/Research/WorldAssemblerM3/Linux134/layout-seed0-walk-gate.json

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+{"schema_version":3,"world_identity":"owner-world/seed/0","owner_voxel_size_um":125000,"core_voxel_size_um":250000,"strate_layout_chunk_size_um":8000000,"strate_layout_chunk_width_subvoxels":8192,"strates":[{"stable_id":"owner-world/seed/0/strate/0/generator/SurfaceWorld","order":0,"strate_index":0,"generator_kind":"SurfaceWorld","recipe_id":"SurfaceWorld.Heightfield2D","recipe_version":2,"interior_bottom_um":-504000000,"interior_top_um":8000000,"voxel_size_um":250000,"lattice_origin_um":[0,0,0],"ceiling":{"kind":"ceiling","bottom_um":7500000,"top_um":8000000,"present":true,"diggable":true,"protected":false,"solid_density_q16":524288,"behaviour":"solid ceiling from strate BoundarySealThickness; breakable by default","density_side":"interior-facing lower surface","cap_path":"shared resolved-layout density band"},"content":{"kind":"content","bottom_um":-503500000,"top_um":7500000,"present":true,"diggable":true,"protected":false,"solid_density_q16":65536,"behaviour":"resolved generator interior","density_side":"none","cap_path":"none"},"bedrock":{"kind":"bedrock","bottom_um":-504000000,"top_um":-503500000,"present":true,"diggable":true,"protected":false,"solid_density_q16":524288,"behaviour":"solid bedrock floor from strate BoundarySealThickness; 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